Dear Alfonso,

I would like to apply a high-pass filter to my data, I have therefore set the band pass to [0.008 inf] (applying after regression, empty confound list, no despiking, no detrending).
In the options tab I have checked the 'create confound corrected timeseries' box.
Afterwards, I extracted the global signal from both the raw data and the corrected timeseries. When subsequently computing the power spectrum for both timeseries, I am still getting a large peak in the very low frequency range. For comparison I used MATLABs highpass function on the raw global signal and computed the power spectrum in a similar way (see attached figure). The latter looks quite different, with very low frequencies being suppressed more clearly.

Is band pass filtering incorporated in the confound corrected timeseries? Or is the filter only applied within CONN (analyses) itself?

Many thanks in advance.
Best regards,
Bram